Update external docs

Author: garrett

external/bots/README.md

@@ -32,8 +32,8 @@ For managing these images:
 
  - `image-download`: Download selected or all test images
  - `image-create`: Create test machine images from scratch (usually through
-   virt-install or downloading a cloud image), with common build and test
-   dependencies for Cockpit projects preinstalled
+   downloading a cloud image), with common build and test dependencies for
+   Cockpit projects preinstalled
  - `image-upload`: Upload a locally built test image to the official image servers
 
 For running and debugging the images:

external/wiki/Demos-and-Talks.md

@@ -4,7 +4,8 @@ source: https://github.com/cockpit-project/cockpit/wiki/Demos-and-Talks
 ---
 
 ### 2024
- * [Upstream cross-project testing: Never break your API consumers](https://pretalx.com/devconf-cz-2024/talk/KDZZES/) (Martin Pitt), devconf.cz; [video](https://www.youtube.com/live/ipb-_rgFNa4?si=7qSWYaE3CETZMtaW&t=14200), [slides and notes](https://github.com/cockpit-project/presentations/tree/main/2024-upstream-cross-project-testing)
+ * [Upstream cross-project testing: Never break your API consumers](https://pretalx.com/devconf-cz-2024/talk/KDZZES/) (Martin Pitt), devconf.cz; [video](https://www.youtube.com/watch?v=LyXOdDV98LM), [slides and notes](https://github.com/cockpit-project/presentations/tree/main/2024-upstream-cross-project-testing)
+ * [How we integrated Btrfs in Cockpit](https://pretalx.com/devconf-cz-2024/talk/JEPNDF/) (Jelle van der Waa), devconf.cz; [video](https://youtu.be/ipb-_rgFNa4?t=4594), [slides](https://pretalx.com/media/devconf-cz-2024/submissions/JEPNDF/resources/Cockpit_Btrfs_vS8beTQ.pdf)
 
 ### 2023
  * [Monty Python's Flying Cockpit](https://devconfcz2023.sched.com/event/3e54fcb5b2f905fedc4810af54ce29c8) (Allison Karlitskaya and Martin Pitt), devconf.cz; [video](https://www.youtube.com/watch?v=ZAVUG6E0Xd4), [slides and notes](https://github.com/cockpit-project/presentations/tree/main/2023-devconf-beipack-pybridge)

external/wiki/Proxying-Cockpit-over-Apache-with-LetsEncrypt.md

@@ -109,8 +109,9 @@ Make sure you changed `/etc/cockpit/cockpit.conf` to include the following:
 
 ```ini
 [WebService]
-Origins = https://cockpit.your-domain.com http://127.0.0.1:9090
+Origins = https://cockpit.your-domain.com wss://127.0.0.1:9090
 ProtocolHeader = X-Forwarded-Proto
+ForwardedForHeader = X-Forwarded-For
 AllowUnencrypted = true
 ```